Calibration and characterization of self-powered floating-gate sensor arrays for long-term fatigue monitoring

Nizar Lajnef, Shantanu Chakrabartty, Niell G. Elvin

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

Measurement of cumulative loading statistics experienced by a structure is essential for monitoring long-term fatigue in biomechanical implants. However, the total power that can be harvested using typical in-vivo strain levels is less than 1μW. In this paper we characterize the performance of a silicon floating-gate injector array that can be used in conjunction with a piezoelectric transducer to facilitate long-term, battery-less fatigue monitoring. Measured results from a fabricated prototype in a 0.5μm CMOS process demonstrate that device can sense, compute and store loading statistics for over 70,000 of continuous simulated stress-strain cycles and this value can be increased beyond 107 by appropriate scaling of the system parameters. The measured results also show excellent agreement with its theoretical model and the nominal power dissipation of the array was measured to be less than 800nW.

Original languageEnglish
Title of host publication2008 IEEE International Symposium on Circuits and Systems, ISCAS 2008
Pages1096-1099
Number of pages4
DOIs
StatePublished - 2008
Event2008 IEEE International Symposium on Circuits and Systems, ISCAS 2008 - Seattle, WA, United States
Duration: May 18 2008May 21 2008

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
ISSN (Print)0271-4310

Conference

Conference2008 IEEE International Symposium on Circuits and Systems, ISCAS 2008
Country/TerritoryUnited States
CitySeattle, WA
Period05/18/0805/21/08

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